Method for atomizing and drying liquid



June 3, 1930.

A. NYROP METHOD FOR ATOMIZI NG AND DRYING LIQUIDS Filed Aug. 5. 1926Patented June 3, 1 930 N T D STATES V AAGE NYROP, or cornnnaeniv, DEMARK METHOD non aromrzme, Ann pnvmq moun Application filed August 3,1926, Serial No. 126,919, and minemark May 10,- 1926.

It. should, however, be ,here said-theta The present invention refers toa method of atomizing and drying liquids.

The characteristic feature of the method consists in that the liquidwhich is to be I 5 dried in an atomized state receives a direction oftravel which is essentially at right angles to the direction in whichthe; drying air is travelling, so that the particles of liquid,-alsoafter they have met the drying airwi1l have an independent movementrelatively to the air and the drying effect will be the more intense.

This is-an essential condition for obtaining a good product as it hasbeen found to be a faot that in-drying various emulsions,

such as milk, cream and the like, the best product is obtained by thetime which is required for the completion ofthe drying:

process being as short as possible while at the same timethe temperatureemployed being as low as possible.

These conditions are met with in the most favourable manner by theparticles of liquid during the time they are under the effect of thedrying air, being given an opportunity to be exposed to. the highestpossible influence of the air, whereby the evaporation of the moisturecontained in the particles is best promoted. a

The idea of the method is to supply the drying air or the liquidintermittently, as this has proved to be of special advantage intreating certain substances which herein- 1 formance of the after shallbe separately described.

An apparatus which is particularly well suited for performing thepresent method is shown in the drawing, in which Fig. 1 is a .verticalsection through a drying vessel, 7 1

Fig. 2 a vertical section on the lines A-A in Fig. 1. 1

In the drawing thejnumeral 1 indicates a vessel of a suitable shape andsize. The

drying air is conducted into" this vessel in a tangential directionthrough a pipe 2 opening into the upper part of the vessel 1. In thecentre of t e cover of the vessel 1 is disposed an atomizer 3 of anysuitable design,

which, however, does not form any part of the present invention.

I the vessel -1, having its. upper end rotary cially adapted for'thepurpose,

atomizerrrtype Nyroprwould be spej- 1 Immediately beneath. the atomizer.an I air i outlet pipe4= is arranged in the bottom of" upwards into thesaid vessel. With the apparatus thus lowing manner: 7

u P jec ing The liquid 'to be treated introduced the vessel 1 throughthe atomizerf3-in such a manner that the 'atomizedtliquid wilrbeiviolently dashed into the *vessel, in which. it,

will, under ,action'ofthe centrifugal force, its gravity andtheinfluence of thecurrent of air entering. through the pipe 2 through. a:spiral .curve the :turnsof which.

increase .indiameter, approximately as indie travel cated in thedrawingby th dotted lines.- 1: While/the atomizedliquid is travellingalong this, course all the moisture do'nfained" in .its particles willbe I evaporated and the remainingowder, which consists of the', solidand t e not readily evaporated components ofthe emulsion, will,eventually, settle on the; bottom-ofthe vessel i1,as in-. f dicatedat 6in Fig. 1, while the used drying air together with, the moistureit =hasab? sorbed will the pipe 4.

30 V I pass off-V from. the vessel through From the'foregoingdescription of the per- I presentvmethodit will .be evident that whiletheatomized liquid come ing from the atomizer- 3 willphave' a move ment-,vvith, essentiall' an; outward and downwarddirectiomt edrying aircomingfrom the pipe -2 has a movementof =aI1';lI1-' Ward anddownwarddirection towards the center. of the vessel. .The result isthatEthep': main directions of these two currents will j meet each otherat a certain angle'whichffc'an be adapted to suitthe conditionsjso thatthe particles of liquid, when they 'on' abutting with'the' airchangetheirdirection of,'travel,,- I will not immediately get adirectioncoinciding with that ofthe air, but will continue 1 theirtravelrelatively to the air surrounding the particlesgwhemby it is assuredthat theair will more quickly cause the contents of liquid in theparticles to evaporate as there by the air can absorb more moisturewithin the same period of time.

7 For still further increasing this favourable effect an intermittentlyacting valve or the like may be interposed either in the outlet pipe 4-or in the supply pipe 2 so that the air within the vessel will be causedto vibrate very violently and thereby the friction between the particlesof liquid and the air increased.

The liquid may be supplied into the vessel 7 either continuously orintermittently. It has been found that an intermittent supply is ofadvantage with ""certain substances, This, for example, is the case indrying emulsions of oils and water when it is desirable to obtain adried powder soluble in .oil. In such cases an intermittent supply ofthe oil will be the only means by which it can be made to settle on theouter side of the dried particles.

In the foregoing a constructional form has been described which mightchiefly be employed for the production of milkpowder. The apparatuscanalso be employed in many other ways," for example, for drying mud,whilst products of combustion could be supplied, the same as theapparatus for the actuation of the mud which, for the purpose ofincreasing its filtration, is necessary before the drying. may also beemployed for cooling the air from a saltpetre furnace, whereby the yieldof saltpetre' might be. increased.

It might also be here mentioned that the apparatus could also be usedfor cracking, for producing steam by spraying water into hot products ofcombustion, and for the production of nitric acid by letting the'air,saturated with water pass an electric are, as also for letting lightrays act on the finely-divid-- ed'matter to produce vitamines inspecially prepared oils. In other words, by effecting an irradiation bymeans of light rays D- vitamines are activated.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is 2- Method for atomizing and drying liquids-vconslstlng 1n hurhng out particles .of liquid from an atomizer at thetop of a vessel in a layer and pressing the particles in adownwardlyextending spire with increasing radius of curvature, and simultaneouslyintroducing drying air at the top of the vessel and adjacent the side ofoutcoming particles of liquid so that the air will pass through theparticles of the liquid in a spire with decreasing radius of curvaturebut with the same direction of movement as the particles of liquid.

In testimony whereof I afiix my signature.

AAGE N YROP.

Finally the apparatus

